On the oral device course, I added this short explanation over why it is possible to improve without the mouthguard (I know I did), but it is much, much harder. Everyone's free to choose their own path, but there's a reason why this is 'The Foundation' in the method :)

I am 18, I’ve had braces, and I now have a permanent retainer behind my teeth. I’ve been following Santiago for a while and have been doing “thumb pulling / 3D oral pushing” for about 3 months, and I wear a Reviv mouthguard. I’ve come to the conclusion that for better results, I probably need to have my retainer removed. Can someone (preferably Santiago 😊) confirm this? And what about the retainer on my lower teeth? And what should I tell my dentist? Thanks in advance!

So measuring from outer most parts of my pre molars (since it’s most accurate) my pallets is widening every time I thumb pull. I feel it and my family noticed it. Thing is when I sleep it typically goes back down, I’ve been using a MYOBRACE for 3 days since today which is actually keeping it expanded surprisingly!!! I ordered a Reviv 3 a few days ago as well. Once that arrives I’m doing thumbpulling 2 hours a day.